cppinitbook_public's Introduction

C++ Initialization Story, Public

Source code and issues for the "C++ Initialization Story" book - https://leanpub.com/cppinitbook

more in a separate blog post: See My New Book: C++ Initialization Story - C++ Stories

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The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Chapter 3: Copy and Move Operations - A compiler-generated copy constructor

NOTE: If anyone can correct me or agree with my finding, please state it here. :)

The book states: The compiler will generate an implicit copy constructor for you if your class complies with the following key rules:

Your class doesn't have a user-defined copy assignment operator and a user-defined destructor.

However, cppreference states:

The generation of the implicitly-defined copy constructor is deprecated if T has a user-defined destructor or user-defined copy assignment operator.

Here is an example of a simple generated code with C++ Insights: (In which case the compiler does not mark the copy constructor as deleted).


#include <iostream>
#include <memory>
#include <string>

class Foo
{
  
  public: 
  inline constexpr Foo() noexcept = default;
  inline Foo & operator=(const Foo & rhs)
  {
    if(this == &rhs) {
      return *this;
    } 
    
    this->m_s.operator=(rhs.m_s);
    this->m_i = rhs.m_i;
    return *this;
  }
  
  
  private: 
  std::basic_string<char> m_s;
  int m_i;
  public: 
  // inline ~Foo() noexcept = default;
};

int main()
{
  Foo foo = Foo{};
  return 0;
}

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Chapter 3: Copy and Move Operations - A compiler-generated copy constructor

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